Light-regulator for projecting moving pictures.



F. W. HDCHSTETTER.

LIGHT REGULATOR FGR PHOIECTING MOVING PICTURES. APPLICATION FILEDnEc.a.I9I5.

1,301 ,264. Patented Apr. 22, 1919.

W//VESSES: INI/EN TOR FREDERICK W. HOCHSTETTER, or

NEW YORK, 1t; Y.,1ssIGNo'R-'To H. P. PATENTS AND rnocEssEs company,INC., A conPoitAnoN or NEW Yorin.

nIeHnnEeLAToR Fon rnomcrme MOVING PICTURES.

Specification of Letters Patent.

Patented Apr. 22, 1919.

Application filed December 3, 1915. Serial No. 64,861.

To all whom t may concern.'

Be it known that I, ITREDERICKv W. HOCH- STETTER, a citizen of theUnited States, and a resident of New York, county and State of New York,have invented certain new and useful Improvements in Light-Regula torsfor Projecting Moving Pictures, of which the following is a full, clear,and exact specification.

his invention relates to a class of devices adapted to be used inconjunction with moving picture apparatus.

My invention has for its object primarily to provide a device designedto be employed particularly on n moving picture machine whereby themarginal rays of light operative on the ictures when projected will becut-out so tiat only the dlrect rays of the light will be utilized, thusovercoming the variations of light which tend to largely impair theetlect` of the pictures incident to the methods of projection ordinarilyemployed. This is accomplished mainly by providing an apertured opaquediaphragm adapted to be disposed in the path of projection of thepictures of a ilm so that the marginal rays of light operative on thepictures will be cut-out.

A further object of the invention is to provide a. light regulator of asimple and elicient construction, and which may be made so as to beadapted for use' in conjunction with moving picture projecting machinesof various types.

A practical embodiment of the invention is represented in theaccompanying drawing forming a part of this specification in whichsimilar characters of reference indicate corresponding parts in all theViews, the said invention being more fully described hereinafter, andthen pointed out in the claims at the end of the description.

In the drawing, Figure 1 is a front View of one form of light regulatorembodying my, invention.

ig. 2 is a section taken on the line II-II of Fig. 1.

Fig. 3 is a view showing the manner in which the device may be used inconjunction with a moving picture projecting machine, and

Fig.V 4 is a section taken through the lens barrel of the machineshowing the preferred manner of using the device.

The device, or light regulator has a diaphragm, or plate 1() made ofmetal, or any other desired opaque material, and thisdiaphra m is preerably circular in shape so as to` e mounted interiorly of the lensbarrel, as l1, ofv a moving picture projecting machine, as 12, of asuitalble type, though this da hragm may be of any other desired formwiiereby it may ybe eii'ectually used by being mounted in the lensbarrel, or otherwise employed in conjunction therewith.

Through the diaphragm 10 is an aperture 13 which is preferablysubstantially similar in shape to each picture of, for instance, a film,as 14, adapted -to be transmitted through the projecting machines. Onthe peripheral edge of the diaphragm 10 may be a projecting annularflange l5 serving to permit the diaphragm to "be retained in a truevertical position in the lens barrel, or any other suitable means may beemployed for properly supporting the diaphragm for use with the machine.

When the device is employed in conjunction with a moving pictureprojecting machine provided with two lenses, as 16 and 17, in its lensbarrel, the device may be disposed in the barrel back of the lens 16, asindicated, at 18, or it may be arranged in the barrel between thelenses, as at 19, or the device may be positioned in the free end of thebarrel, as at 20, in front of the lens 17. Vhen only one lens is used inthe barrel of the machine the device may be disposed in front, or in theback of the lens. In each instance the device is arranged so that theaperture 13 of the diaphragm will be in the optical axis of the pictureswhen being projected, and the device is also disposed so that theannular ange 15 will preferably be in opposed relation to the lamp ofthe machine. The rays of the light will then be directed into theannular flange so that the inner ra s will pass through the aperture ofthe iaphragm whilethe outer rays of light will be cut-out by contactingwith the inner surface of the annular flange as well as contacting withthe margin-a1 parts of the diaphragm 10. Only the direct or inner raysof the light will thereby pass through the aperture of the diaphragm,and the plctures appearing on the screen will be uniformly illuminatedwhich in turn will sharpen as well as produce pronounced contrastsbetween the high li hts and shadows of the photography of tltie imagesof the pictures.

In the foregoing description, I have embodied the preferred form of myinvention, but I do not wish to be understood as limiting myselfthereto, as I am aware that modifications may be made therein withoutdeparting from the principle, Aor sacrificing any of the advantages ofthis invention, therefore I reserve to myself the right to make suchchanges as fairly fall within the serge thereof.

aving thus described my invention, I claim as new and desire to secureby Letters Patent z- 1. The combination With a lens barrel having a lensremovably secured Within one end thereof by means of a bushing having aninternal configuration similar to the internal configuration of thebarrel inwardly of the bushing, of an apertured diaphragm havin amarginal flange and removably slidab y positionable at points Within thebarrel inwardly of the lens or Within the seeurin 'bushing at the outerside of the lens, su antial y as described.

2. The combination with a lens barrel having a pair of spaced lensesremovably secured Within the ends thereof by means of bushings havinginfernal configurations similar to the internal configuration of thebarrel bet/Ween the lenses, of an apertured diaphragm having a marginalflange and slidably positionable at points Within the barrel between thelenses or Within the securing bushings at the outer side of either ofthe lenses, substantially as described.

This specification signed and witnessed this second day of December A.D. 1915.

FREDERICK W. HOCHSTETTER.. Witnesses:

Ro'r. B. Ao'rr, M. DERMODY.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents. Washington, D. C.

